bird's foot vs bird

bird's foot and bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird's foot	Yes	No	No	No
bird	Yes	No	Yes	No

bird's foot (noun)	bird (noun)
the foot of a bird	warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
	badminton equipment consisting of a ball of cork or rubber with a crown of feathers
	a cry or noise made to express displeasure or contempt
	the flesh of a bird or fowl (wild or domestic) used as food
	informal terms for a (young) woman

bird's foot (verb)	bird (verb)
	watch and study birds in their natural habitat